There is a freeware part. NW2 Mk1 along with all the ancilliary files and repainting pack
The payware part has the NW2 Mk5 and the TR2 or TR3 cow and calf.
Note the calf has a working "cab" (Well three dials anyway!!!!

How does this differ from the SW1200?
It is only 1000hp rather than 1200hp. There are differences in the hood and cab interior. Built between 1939 and 1949 so will compliment my steam locomotives.
Dick